PT-2021-21108 · Selinux+6 · Selinux+6

Garrett Tucker · Published 2021-07-01 · Updated 2025-11-03 · CVE-2021-36087

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Low

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions: SELinux version 3.2

Description: The issue is related to a heap-based buffer over-read in the ebitmap match any function, which is called indirectly from cil check neverallow. This occurs due to a lack of checks for invalid statements in an optional block.

Recommendations: For SELinux version 3.2, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALSA-2021:4513

CESA-2021_4513

CVE-2021-36087

DLA-3930-1

OPENSUSE-SU-2024:10990-1

RHSA-2021:4513

RHSA-2021_4513

RLSA-2021:4513

USN-5391-1

Affected Products

Almalinux

Centos

Linuxmint

Red Hat

Rocky Linux

Selinux

Ubuntu

References · 36

• 🔥 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32675 · Exploit
• https://github.com/SELinuxProject/selinux/commit/340f0eb7f3673e8aacaf0a96cbfcd4d12a405521 · Patch
• https://ubuntu.com/security/CVE-2021-36087 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-36086 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-36087 · Vendor Advisory
• https://osv.dev/vulnerability/USN-5391-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2021:4513 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-36087 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-36087 · Security Note
• https://linux.oracle.com/errata/ELSA-2021-4513.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-36087 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U7ZYR3PIJ75N6U2IONJWCKZ5L2NKJTGR · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3930-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-36084 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2021:4513 · Vendor Advisory